We recently added the following to the New and Revised Airports Advisory Circulars page on the FAA website:
Errata Sheet for AC 150/5340-1M, Standards for Airport Markings
Errata Sheet for AC 150/5340-18G, Standards for Airport Sign Systems
Industry Letter Delaying Implementation and Conformance Dates in Advisory Circulars 150/5340-1M and 150/5340-18G
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